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1 UCCS ENSC/PES 2500: Renewable Energy Spring 2011 Test 3 name: 1. These waves travel through the body of the Earth and are called S waves. a. Transverse b. Longitudinal c. Amplitude d. Trough 2. These waves are known as P waves. a. Transverse b. Longitudinal c. Amplitude d. Trough 3. S waves stand for: a. Short b. Shear c. Sound d. Sharp 4. P waves stand for: a. Peak b. Portable c. Pressure d. Particle 5. The motion of a fluid beneath the surface decays exponenetially with depth, so water particles follow trajectories. a. Straight b. Streamline c. Circular d. Random 6. Norwegian system in which sea waves are focused in a tapered channel on the shore line. a. Venturi System b. Bernoulli Theorem c. Tidal Inlet d. TAPCHAN 7. A oscillates vertically due to the direction of wave motion of floater which energizes a linear generator tethered to the sea bed. It is a point absorber which absorbs power from waves travelling in all directions, & extracts approximately 50% of incident wave power.

2 8. In a the base of the device is open to the sea, so incident waves force the water inside the colums to oscillate in the vertical direction. The air above the surface of the water in the column movies in phase with the free surface of the water inside the column and drives the air turbine. a. Archimedes Wave Swing d. Oscillating water column 9. The is a semi-submerged serpentine construction series of cylindrical hinged segments pointed towards incident waves. 10. The turbine has a symmetric profile with perpendicular direction to the airflow. a. Wells b. Impulse c. AWS d. Pelamis 11. The turbine has fixed guide vanes between in which a turbine rotor revolves. a. Wells b. Impulse c. AWS d. Pelamis 12. A tsunami or seismic sea wave is also known as a(n): a. Tidal Wave b. Harbour Wave c. Earthquake d. Sleeper Wave 13. The concept of the is theoretically one of the most efficient of all wave energy schemes. However, utilizing this concept at a full scale is difficult to extract energy from a randomly rocking body. 14. The direction of waves travelling in deep water is obviously dictated by the direction of the generating them. a. Current b. Particles c. Wind d. Sun

3 15. Waves located within or close to the areas where they are generated are called: a. Local b. Foreign c. Tsunamis d. Storm waves 16. The size of the waves generated by any wind field depends upon the wind speed, its duration and the: a. Trough b. Fetch c. Temperature d. Depth 17. is another option for power generation. Here, the turbine generators are run in reverse and act as motor-pump sets, powered by the electricity from the grid. Additional water is thus pumped behind the barrage into the basin, to provide extra water for the subsequent ebb generation phase. a. Embankment b. Flood pumping c. Basins d. Caisson 18. Power can be generated from a barrage in three main ways. The most commonly used method is generation. a. Flood b. Ebb c. Bulb d. Range 19. When waves partially or wholly cancel one another out reducing the overall amplitude is called: a. Destructive interference b. Constructive interference c. Nodes d. Reflection 20. The potential energy, due to the difference in water levels across the barrage, is converted into. a. Rotational kinetic energy b. Electricity c. Kinetic energy d. Tidal streams 21. are like the vibrations that can be set up in the sound boxes of some musical instruments, amplifying certain frequencies of the original sound. a. Coriolis forces b. Tidal ranges c. Neap tides d. Resonances

4 22. Forces that are due to the spin of the earth, and which deflect tidal currents from the paths that they would otherwise have taken are called: a. Resonant b. Spring Tides c. Coriolis Forces d. Neap Tides 23. When the sun and the moon pull together (in line), whether both pulling on the same side of the earth or each opposite sides, the result is the very high. a. Spring Tides b. Neap Tides c. Coriolis Force d. Tidal Waves 24. When the sun and the moon are at 90 degrees to each other, the result is the lower. a. Spring Tides b. Neap Tides c. Coriolis Force d. Current effect 25. The effect (that is, the tendency of any mass in motion to try to continue in a straight line rather than be constrained to move in a circle), is the result of the fact that the earth and the moon rotate around each other. a. Centripetal d. Electro-magnetic 26. The effect, relates to the gravitational pull of the moon, which draws the seas on the side of the earth nearest to the moon into a bulge towards the moon, whilst the seas furthest from the moon experience a reduced lunar pull. a. Centripetal d. Electro-weak 27. As the earth rotates on its axis, the pull will maintain the high tide patterns, as it were under the moon. That is, the two high tide configurations will in effect be drawn around the globe as the earth rotates, giving, at any particular point, two tides per day. a. Lunar b. Solar c. Galactic d. Oceanic

5 28. energy is the result of the interaction of the gravitational pull of the moon and, to a lesser extent, the sun on the seas. a. Rotational d. Tidal 29. Schemes that use tidal energy rely on the tides, and the resultant upstream flows and downstream ebbs in estuaries and the lower reaches of some rivers, as well as, in some cases, tidal movements out at sea. a. Single-daily b. Twice-daily 30. The turbine uses nozzles aimed at cupped blades to develop rotational speeds up to 1300 rpm. a. Francis b. Kaplan c. Pelton d. Faraday 31. Water flow to the power plant from the dam is through a large pipe called the: a. head b. penstock c. Kaplan d. Pelton 32. Modern turbines are of two major types - the & the reaction. a. action b. fixed c. pitched d. impulse 33. Electricity that can be generated by small-scale or low-head units is sometimes referred to as: a. penstock b. Pelton c. Kaplan d. micro-hydro 34. The largest share of renewable energy in the U.S. comes from: a. Wind b. Natural gas c. Hydro d. Petroleum 35. Fourneyron s turbine is a machine. a. horizontal-axis b. vertical-axis 36. Fourneyron s turbine use to direct the water, on to the blades, considering the fact that the turbine runs completely submerged. a. Pelton runners b. breastshot wheels c. guide vanes d. undershot wheels

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